Type-writing machine.



L" R. ROBERTS.-

TYPE WRITING MACHINE.

APPLICATION FILED JAN. I9, I9I4.

Patented Apr. 23, 1918.

IIIIIiII II.

LYIVIAN R. ROBERTS, F RUTHERFORD, NEW JERSEY, ASSIGNOR'TO UNDERWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

man warn TYPE-WRITING MACHINE.

L2fi3fi4p Specification of Letters Patent. Patented A111". 23, 191%.. Application filed January 19, 1914. Serial No. 812,975.

To all whom it may concern: 3 and an arm 4 extending upwardly from Be it known that I, LYMAN R. ROBERTS, the fulcrum. In front of each arm 4 is a a citizen of the United States, residing in sub-lever 5 fulcrumed on a rod 6 and extend- Rutherford, in the county of Bergen and ing upwardly therefrom in position to be 5 State of New Jersey, have invented certain actuated by the arm 4. A thrust-rod or link new and useful Improvements in Ty e- 7 is pivoted at one end to the lever 5 and Writing Machines, of which the following at its forward end to a type-bar 8 pivoted i a ifi ti I I at 9 to a type-ban segment 10, said type- This invention relates to a type-bar action bar adapted to swing upwardly and rears 10 for use in writing machines. wardly about its fulcrum 9 to the printing An object of the invention is to provide position in front of the platen 11, as shown an improved form of leverage-decreasing in Fig. 2. mechanism for actuating the type-bars, and. The arm 4 of the type-bar, as shown in in which the parts are arranged in a com- Figs. 1 and 2, has a shiftable connection or 15 pact and convenient manner. point of contact with the sub-lever 5, one

The main or key-driven levers are in the or both of the contacting faces of the levers form of bell-cranks, each having an arm eX- being slightly curved so that at the comtending forwardly from its pivot andalso mencement of the key-stroke, the upper ends an upwardly extending arm. A sub-lever of the lever 5 and arm 4 are in contact, and 20 having an operating connection with the as the key is depressed the point of contype-bar and pivoted at its lower end in tact graduall moves downward, and at the front of an upwardly extending arm, has a completion 0 the type-stroke is near the fulrolling or shifting contact with the key crum 6. lVith this arrangement a substanlever during the type stroke, the point of tially uniform and even'touch throughout 25 contact at the beginning of die stroke being the type-stroke is provided. remote from the pivots of the key lever and At the beginning. of the stroke, the point sub-lever, and gradually moving toward the of contact being at a considerable distance pivot during the key stroke. The fulcrum from the fulcrum 6, the power applied to of the sub-lever is above that of the key the key lever is effective instarting the type 30 lever, so that during the type stroke, said bar; and during the type-stroke the point of point of contact is brought comparatively contact between the lever 5 and arm 4 moves close to the sublever fulcrum, thus accelertoward the fulcrum 6 so that the ratio of ating the type-bar. The sub-lever may be the eifectlve length of the arm 5 (that is, connected through a link of thrust-rod to a from the pivot 6 to said point of contact) 35 pivoted type-bar for throwing the latter to that of the arm 4 is decreased, so that the upwardly and rearwardly against the front speed of the type-bar relative to the key is face of the platen. accelerated.

Other features and advantages will here The pivotal movement of the type-bar inafter appear. may be limited by a stop 12 on the segment 40 In the accompanying drawings, 10 in a position to engage the type-bar when Figure 1 is a sectional elevation viewi the type 13 is a short distance from the showing one form of the invention, the parts platen, the resiliency of the type-bar permitbeing in their normal position of rest. ting the type to be carried by momentum to Fig. 2 is a similar view, but showing a the printing point. A returning spring 14 45 key depressed and a type-bar thrown up to may be connected between the upper ends of printing position, and also showing in the key lever and the sub-lever 5, the ends broken lines a key and a type-bar in their of said levers having offset extensions 14 normal positions of rest. to accommodate the spring. The return of Figs. 3 and 4 are views similar to Figs. 1 the key lever'may be effected or assisted by a 50 and 2 respectively, but showing a modified spring 15, the upward movement of the key construction. being limited by a stop 16.

The key levers 1 are shown in the form of In the form shown in Figs. 3 and 4., the bell-cranks fulcrum'ed on a rod 2 and each upper end of the arm 4 is in contact with comprising a horizontal arm extending forthe upper end of the sub-lever 5, butns the 55 wardly from the fulcrum and having a key arm 4 swings forwardly during the typestroke a lug 17 on the arm 4 is brought into contact with the sub-lever 5 at a point a short distance above the pivot 6. After the lug 17 contacts with the sub-lever the speed of the latter and consequently of the typebar relative to the key lever is materially increased, and the upper ends of the key lever and sub-lever-are gradually separated, and at the end of the stroke assume the relative position shown in. Fig. 4:. The returning spring 14 may, as shown in Figs. 3 and 4:, be connected between the link 7 and a lug 18 on the type-bar.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others. Having thus described my invention, I claim: I

- 1. In a type-bar action, the combination with a key lever having an arm extending forwardly from its fulcrum and an upwardly extending arm, of a sub-lever pivoted in front of saidupwardly extending arm and extending upwardly from its pivot and having a shiftable connection above its pivot with the upwardly extending arm of the key lever, causing the sub-lever to rotate as the key-lever rotates and in the same angular direction, and a type-bar operatively connected to the sub-lever.

2. In a type-bar action, the combination of a key lever and a sub-lever each having an arm extending upwardly from its fulcrum, said arms contacting at a point above and remote from both the pivots at the beginning of the key-stroke, and contacting at a point nearer both said pivots at the completion of the stroke, and a type-bar operatively connected to said sub-lever. V

3. In a front-strike type-bar action, the

combination with a type-bar and pivot therefor, of a key lever having an upstanding arm, a sub-lever connected to the type-bar below its pivot and in contact with said arm of the key lever, the point of contact be tween the key lever and the sub-lever being remote from the fulcrums of both said levers at the beginning of the type-stroke and comparatively near to both said fulcrums at the completion of the type-stroke, said fulcrums being so positioned that the effective length of the sub-lever relative to that of the key lever is less at the completion of the type-stroke than at the be ginning.

4. In a type-bar action, the combination with a key lever having an arm extending forwardly from its pivot and an upwardly extending arm, of a sub-lever extending upwardly from its pivot in front of said upwardly extending arm and having its pivot a substantial distance above the pivot of the key lever, a type-bar, and a connection between the type-bar and said sub-lever, said sub-lever and said upwardly extending arm being in contact during the type-stroke, the point of contact being above both said pivots and gradually moving downward toward said pivots during the type-stroke.

5. The combination with a bell-crank lever having an arm extending upwardly from its pivot, of a sub-lever pivoted in front of said arm and extending upwardly from its pivot, a type-bar connected to said sub-lever, the upper ends of the sub-lever and said arm being in contact at the beginning of a typestroke, said arm formed to engage the sublever at a point adjacent its fulcrum during a succeeding portion of the type-stroke.

6. In a type-bar action, the combination with a key lever having an arm extending upwardly from its pivot and swinging forwardly during the key-stroke, of a sub-lever pivoted in front of said arm and extending upwardly from its pivot and having a shifting connection with said arm during the key-stroke and swun forwardly by said arm during the key-stroke, a type-bar in front of the sub-lever, and a thrust rod connecting the sub-lever and type-bar and having a forward thrust imparted thereto by the sublever during the key-stroke to actuate the type-bar.

7. In a type-bar action, the combination with a key lever having an arm extending upwardly from its pivot, of a sub-lever also extendin upwardly from its ivot, the pivot of the su -lever being above t e pivot of the key lever, said arm and sub-lever having a rolling contaet'during the type-stroke, the point of contact moving toward said pivots during the key-stroke, the arrangement being such that the angular speed of the sublever is greater than that of said key lever arm, and the outer ends of the sub-lever and said arm are moved apart during the keystroke, and a returnin spring connected between said outer en s for returning said levers.

8. In a type-bar action, the combination with a key lever having an arm extending upwardly from its pivot and moving forwardly during the key-stroke, of a sublever pivoted in front of said arm and extending upwardly from its pivot and having a shiftable connection above its pivot with said upwardly-extending arm for causing the sub-lever to rotate in the same angular direction about its pivot as the key lever rotates during the key-stroke, a type-bar pivoted in front of said sub-lever, and a connection between the sub-lever and typebar for transmitting a forward thrust from the sub-lever to the type-bar to swing the -type-bar to printing position.

9. In a type-bar action, the combination with a key lever having an arm extending upwardly from its pivot and having a forward movement during the key-stroke, of a sub-lever pivoted a substantial distance 130 1,268,704: ltll above the pivot of the key lever and extending upwardly from its pivot in front of said arm and having a shiftable contact with said arm during the key-stroke, said sub lever being swung forwardly by said arm during the key-stroke, the point of contact between said sub-lever and arm being remote from said pivots at the commencement upwardly from its pivot and having a forward movement during the key-stroke, of a sublever pivoted a substantial distance above the pivot of the key lever and extending upwardly from its pivot in front of said arm and having a shiftable contact with said arm during the key-stroke, said sub-lever being, swung forwardly by said arm during the key-stroke, the point of contact between said sub-lever and arm being remote from said pivots at the commencement of the key-stroke, and comparatively near said pivots at the completion of the key-stroke, the ratio of the distance between said oint of contact and key lever pivot to the distance betweensaid point and the sublever pivot being much greater at completion of the key-stroke than at the beginning, whereby the speed of the sub-lever relatively to that of the key lever is greatly increased during the key-stroke.

LYMAN R. ROBERTS.

Witnesses 'llrros H. Irons, F. E. ALEXANDER. 

